Hydraulic System and Mobile Construction Machine

a technology of hydraulic system and mobile construction machine, which is applied in the direction of servomotor, soil shifting machine/dredger, fluid-pressure actuator, etc., can solve the problems of insufficient equalization and standard no longer being satisfied

Inactive Publication Date: 2010-11-04
LIEBHERR FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]It is in particular of advantage if the

Problems solved by technology

Due to the throughflow behavior of nozzles ƒ(√{square root over (Δp)};A), no sufficient equalization can take place to compensate the influence of the tolerances at a l

Method used

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  • Hydraulic System and Mobile Construction Machine
  • Hydraulic System and Mobile Construction Machine
  • Hydraulic System and Mobile Construction Machine

Examples

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Embodiment Construction

[0027]FIG. 1 shows, in a schematic representation, a known hydraulic system 10 for a mobile construction machine such as a hydraulic excavator, which is not shown in any more detail. The hydraulic system 10 is in this respect of a substantially symmetrical structure and has two piston-in-cylinder units 20, 22 which are connected in parallel and are made in the same construction.

[0028]The piston-in-cylinder units 20, 22 have cylindrical piston spaces 21, 23 which are in fluid communication with the further components of the hydraulic system 10 via connections 24, 25. The piston 34, 36 of the piston-in-cylinder unit 20, 22 furthermore has a piston rod 35, 37 which can be moved out by increasing the volume or the pressure in the piston space 21, 23.

[0029]To move in the piston 34, 36 or the piston rod 35, 37 of the piston-in-cylinder units 20, 22, the volume in the ring space 26, 27 is increased, for which purpose fluid is supplied via the connections 28, 29 of the ring spaces 26, 27 wh...

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Abstract

The present invention relates to a hydraulic system having at least two piston-in-cylinder units, at least one equalization line for the pressure equalization between the piston-in-cylinder units and the control pistons, with one respective control piston being associated with a connection of a piston-in-cylinder unit and with at least one 2-way flow regulation valve with a check valve function being in communication with the at least one equalization line.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a hydraulic system having at least two piston-in-cylinder units, an equalizing line for the pressure equalization between the piston-in-cylinder units and the control pistons, with one respective control piston being associated with a connection of a piston-in-cylinder unit.[0002]Such hydraulic systems are used, for example, in mobile construction machinery, in particular in hydraulic excavators. Hydraulic excavators and other mobile construction machinery are also inter alia used for load lifting work. In this case, burst pipe safety valves are prescribed for safety reasons which allow the controlled lowering of the load on the bursting of a hose or of a pipeline.[0003]Two parallel piston-in-cylinder units are typically used for the boom in an excavator, also for the stick with larger machines. An equalization line is installed to ensure a uniform load bearing capacity of the two piston-in-cylinder units.[0004]In acc...

Claims

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Application Information

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IPC IPC(8): F15B13/00
CPCE02F9/2203F15B2211/7128F15B20/005F15B11/22F15B2211/40553F15B2211/40584F15B2211/465
Inventor HELBLING, FRANKGRAEBLING, CYRIL
Owner LIEBHERR FRANCE
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